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Electric Potential Profiles in a Model Single-Path Electrodialysis Unit.

Jan Pagáč1, Petr Kovář1, Zdeněk Slouka1,2

  • 1Department of Chemical Engineering, University of Chemistry and Technology Prague, Technická 3, 16628 Prague, Czech Republic.

Membranes
|November 24, 2022
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Electrodialysis potential distribution was mapped in a model system. Significant potential drops occurred across membranes, especially during high current loads, indicating limiting and overlimiting operation.

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desalinationdiluateelectric potentialelectrodialysisoverlimiting current

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Area of Science:

  • Electrochemical Engineering
  • Separation Science
  • Physical Chemistry

Background:

  • Electrodialysis (ED) is a key electromembrane process for separations.
  • ED systems create spatial gradients affecting local conditions.
  • Understanding electric potential distribution is crucial for ED optimization.

Purpose of the Study:

  • To investigate the spatial distribution of electric potentials within an electrodialysis unit.
  • To model and measure potential profiles in a single diluate channel system.
  • To correlate potential variations with desalination performance and operational regimes.

Main Methods:

  • Constructed a model electrodialysis system with a single diluate channel.
  • Integrated reference electrodes for measuring electric potential profiles.
  • Validated measurements through control experiments at specific flow rates and current densities.

Main Results:

  • Electric potential showed minimal variation vertically and along the diluate channel center.
  • Appreciable potential variations were observed across the diluate channel width.
  • Significant potential drops localized on membranes with ion-depleted zones, increasing sharply at high current densities.

Conclusions:

  • High current densities lead to significant potential drops across membranes in electrodialysis.
  • Observed potential behavior indicates transitions into limiting and overlimiting regions.
  • Potential mapping provides insights into electroconvective phenomena during ED desalination.